ISSN Online: 2688-7231
ISBN Online: 978-1-56700-478-6
Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017)
NUMERICAL STUDY OF REAL GAS EFFECTS IN EXTERNAL HYPERSONIC FLOW FOR MARS ENVIRONMENT
Resumo
Simulation of hypersonic flows involving extreme temperatures
and associated real gas effects such as those encountered
by reentry vehicles has always been critical. Present paper
discusses the development of an in-house solver for computing
the hypersonic flow field in Martian environment with real
gas effects. It is a 2D/axisymmetric, unstructured Navier-Stokes solver incorporated with several flux computation schemes. An 8 species (CO2, CO, C, N2, O2, N, O & NO) and 10 elementary reactions model is incorporated for Mars atmosphere. Various bench mark test cases are used for code validation and verification. Simulation of simple shock tube and inviscid flow over ramp cases show accurate prediction of shock Mach number and flow deflection angle respectively. High enthalpy flow of actual Martian condition is simulated over a cylinder and real gas effects
like chemical non-equilibrium, dissociation are observed as
expected. A test case of shock wave boundary layer interaction
shows that the size of separation bubble in Mars atmosphere is
smaller than Earth atmosphere for similar free stream flow conditions.